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Long-term atmospheric visibility trends in megacities of China, India and the United States
Hu, Yue1; Yao, Ling2; Cheng, Zhen3; Wang, Yungang4
2017-11-01
Source PublicationENVIRONMENTAL RESEARCH
ISSN0013-9351
Volume159Pages:466-473
Corresponding AuthorWang, Yungang(carl@gagogroup.com)
AbstractMillions of premature deaths worldwide every year mostly in China and India are contributed by the poor air quality. The atmospheric visibility is a proven indicator of the ambient air quality. In this study, nine megacities were selected, including Beijing, Shanghai and Guangzhou from China, Chicago, Los Angeles (LA) and New York City (NYC) from the United States, and Mumbai, Chennai and Jaipur from India. The data of visibility, aerosol optical depth (AOD), and meteorological factors from 1973 to 2015 were collected. The temporal variations of annual and monthly percentages of bad days (visibility < 5 km) and good days (visibility > 15 km) were evaluated. Visibility of Chicago, LA and NYC gradually improved during the past 43 years and has reached a very good level (good day percentages: 75-88%; bad day percentages: 0 - 4%). Conversely, visibility in Mumbai, Chennai and Jaipur continued deteriorating and suffered an extremely poor visibility situation in recent years (good day percentages: 0; bad day percentages: 6-100%). Likewise, visibility in Beijing, Shanghai and Guangzhou has experienced the worsening period during the industrial development from 1970s and turned better after the 1990s. A strong seasonal pattern of bad day percentages of each year were observed in most cities, especially in the winter, which is caused by the fossil fuel combustion for heating, relatively high relative humidity, and other unfavorable meteorological conditions. The low visibility events occurred more frequently in days with low wind speeds and specific wind directions, further explaining the seasonal patterns of visibility. With population growth from the period of 2000-2010 to the period of 2011-2015, AOD and bad day percentages both increased in Mumbai, Chennai, Jaipur and Beijing while others were relatively stable. This study demonstrated that the macro-control of pollution emissions could effectively reduce air deterioration. The relationships among visibility variation, meteorological, pollutant and population factors provide valuable scientific support for public health researches, air quality managements (monitoring and forecasting), and clean energy initiatives.
KeywordAtmospheric visibility Air quality Aerosol optical depth Air pollution Public health
DOI10.1016/j.envres.2017.08.018
WOS KeywordPARTICULATE MATTER ; SEASONAL TRENDS ; AEROSOL ; HAZE ; POLLUTION ; REGION ; EXTINCTION ; SHANGHAI ; IMPACTS ; MUMBAI
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Public, Environmental & Occupational Health
WOS SubjectEnvironmental Sciences ; Public, Environmental & Occupational Health
WOS IDWOS:000413280500053
PublisherACADEMIC PRESS INC ELSEVIER SCIENCE
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/61235
Collection中国科学院地理科学与资源研究所
Corresponding AuthorWang, Yungang
Affiliation1.Chengdu Univ Technol, Coll Environm & Civil Engn, Chengdu 610059, Sichuan, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
3.Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China
4.GAGO Inc, 1601 McCarthy Blvd, Milpitas, CA 95035 USA
Recommended Citation
GB/T 7714
Hu, Yue,Yao, Ling,Cheng, Zhen,et al. Long-term atmospheric visibility trends in megacities of China, India and the United States[J]. ENVIRONMENTAL RESEARCH,2017,159:466-473.
APA Hu, Yue,Yao, Ling,Cheng, Zhen,&Wang, Yungang.(2017).Long-term atmospheric visibility trends in megacities of China, India and the United States.ENVIRONMENTAL RESEARCH,159,466-473.
MLA Hu, Yue,et al."Long-term atmospheric visibility trends in megacities of China, India and the United States".ENVIRONMENTAL RESEARCH 159(2017):466-473.
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